Okay kiddo, have you ever played with dolls or action figures? Those are artificial because they are not real people, even though they look like them. Artificiality is when something is made by humans, but it is not exactly like the natural thing.
For example, let's say you have a toy flower made of plastic instead of a real flower made of petals. The plastic flower is artificial because it's not real, but it's still made to look like a real flower.
Now let's think of something bigger than toys, like a machine or a robot. Those things are also artificial because they are not living creatures like humans or animals, but they're made by people to do things we can't do on our own.
So, to sum up, artificiality is when something is made by people and it may look or act like a natural thing, but it is not exactly the same as the real thing.